Thermoplastic resin-coated aluminum alloy plate, and process and

Details Thermoplastic resin-coated aluminum alloy plate, and process and Thermoplastic resin-coated aluminum alloy plate, and process and

1999-05-13

2000-08-08

Copenheaver, Blaine

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283157, 4283159, 4283197, 428458, 428543, 427302, 427327, 425506, B32B 1508

Patent

active

060999535

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a process for producing a thermoplastic resin-coated aluminum alloy sheet intended mainly for the application thereof as material for a can, and an apparatus for producing the same. More specifically, it relates to a thermoplastic resin-coated aluminum alloy sheet used as material for a can being excellent in the formability, the adhesion after forming, the corrosion resistance, the impact resistance, and the flavor-preservability, and which is used not only as popular material for a can such as for a can-top and a drawn can, but also for purposes of cans such as a drawn and ironed can, a can produced by the drawing forming process and then the stretching process, and a can made through the drawing forming process, thereafter the stretching forming process, and then the ironing process, for which the severe formability, the adhesion after forming, and the adhesion after the retort-treatment are required, and an apparatus for producing the same.


BACKGROUND ART

Thermoplastic resin, for example polyester resin laminated-aluminum alloy sheet has been already used for material for a can. However, when the adhesion between a laminated thermoplastic resin layer sheet and the aluminum alloy sheet is insufficient, there is a case where the laminated thermoplastic resin layer peels off from the aluminum alloy sheet during the forming process, or the corrosion of the aluminum alloy sheet is advanced from the portion where the adhesion is insufficient. The adhesion is affected by the formability of aluminum alloy sheet and the properties of the laminated thermoplastic resin layer, and further is largely affected by the condition of the surface of the aluminum alloy sheet. Therefore, in order to improve the adhesion between an aluminum alloy sheet and a thermoplastic- resin layer or coating film, an aluminum alloy sheet has conventionally been subjected to the following surface-treatment. acid treatment or chromic acid treatment. the thermoplastic resin film or aluminum alloy sheet. sheet by anodic oxidation, the oxide film by anodic oxidation having micro pores with the diameter 2000 Angstrom or more, and the depth 5 .mu.m or less and the occupied area rate by micro pores of 5 to 60% (Japanese Laid-Open Publication No. Hei 3-44496). is heated to the temperature of from 250.degree. C. to 650.degree. C. for two hours or more in the atmosphere to form an oxide film 20 Angstrom or more (Japanese Laid-Open Publication No. Hei 6-272015). is subjected to an electrolytical treatment using alternating current in an alkali solution to form an oxide film having a thickness of 500 to 5000 Angstrom and having branched micro pores (Japanese Laid-Open Publication No. Hei 6-267638).
However, in the above-mentioned method (1) of phosphoric acid treatment or chromic acid treatment, since phosphate, chromate, fluoric compound or others is mainly used as the chemical treatment solution to improve the paint adhesion, the treatment is widely used. However, it requires an enormous draining equipment for the draining of treatment solution in order to prevent the environmental pollution. Therefore, method (1) is undesirable from the aspect of preservation of the environment. Further, in the above-mentioned method (2) of coating with the adhesive primer, cost is increased by primer coating, and besides the process for thermosetting of coating film is additionally needed, so it is undesirable from the aspect of productivity. Further, the equipment for exhausting organic solvent is needed. As for the above-mentioned method (3) of forming an oxide film by anodic oxidation having specific micro pores by using a chromic acid solution, a long time is required for forming the oxide film by anodic oxidation, so it is undesirable from the aspect of productivity. Further, when heavy forming process is carried out, the laminated thermoplastic resin layer occasionally peels off from the aluminum alloy sheet. Furthermore, a draining equipment is needed for the prevention of the environmental pollution. I

REFERENCES:
patent: 4962659 (1990-10-01), Imazu et al.
patent: 5100107 (1992-03-01), Ishinabe et al.
patent: 5316777 (1994-05-01), Toyoda et al.
patent: 6017599 (2000-01-01), Sakamoto et al.

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